Description:Wireless giant Verizon is preparing its network to launch 4G technology in 20 to 30 markets in 2010, the company's spokesman John Johnson told Beet.TV at the D: All Things Digital conference. 4G is the next-generation of wireless technology that should support better multimedia and video streaming on cell phones. Verizon's goal is to generate more usage of broadcast TV and personalized video with the 4G rollout, Johnson told us.(1:45)